JPH0633066U - Crack detection device for solidified bodies - Google Patents

Abstract

(57) [Summary] [Purpose] The crack area, which is one of the physical properties of the solidified product, can be calculated from the measured AE signal, and the reliability of the measurement of the physical properties of the solidified product is greatly improved. [Structure] An ultrasonic signal associated with a crack generated in a solidification / cooling process of a glass-like solidified body (test object) 1 is detected by a sensor 3. The AE signal processing unit 4 processes the ultrasonic signal and inputs it to the data processing unit 10 as an AE signal. On the other hand, a crack generated in the vitreous solidified body 1 is photographed by the video camera 7, and the photographed image is recorded in the VTR 8.
The image processing unit 9 extracts only the newly generated crack by taking the difference between the images captured before and after the AE signal is generated. The data processing unit 10 plots the data obtained by the AE signal processing unit 4 and the image processing unit 9, finds the correlation between the AE signal and the area of the crack, and cracks the solidified body 1 from the measured AE signal. Calculate the area.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a physical property measuring device for measuring a physical property value, and more particularly to a crack detecting device for a solidified body which detects a crack generated in a solidified body such as glass used for sealing industrial waste.

[0002]

[Prior art]

 Conventionally, nondestructive inspection such as ultrasonic flaw detection test and AE (acoustic emission) measurement has been performed as a method for detecting physical properties such as cracks of vitrified solids used to seal industrial waste. . This AE measurement is characterized in that it can monitor a wide range without scanning the sensor.

As shown in FIG. 4, a crack detection device for a solidified body usually used for AE measurement includes a sensor (for example, an ultrasonic sensor) 3 for detecting a crack 2 generated in a subject 1, an AE signal processing unit. It is composed of 4.

When the crack 2 occurs in the subject 1, ultrasonic waves of longitudinal wave L (broken line), transverse wave S (solid line), and surface wave R (broken line) as wave modes follow a path (arrow direction) as shown. Propagate the subject 1. The ultrasonic wave propagating through the subject 1 is detected by the sensor 3.

After the detection signal from the sensor 3 is processed by the AE signal processing unit 4, the total number of cracks accumulated, the generation rate, the effective value, and the like are obtained and displayed on a record or a display.

[0006]

[Problems to be solved by the device]

 However, although the occurrence of cracks in the subject 1 can be detected by the AE measurement as described above, it is not always easy to calculate the area of the cracks that have occurred. The present invention has been made in view of the above circumstances, and an object thereof is to provide a crack detection device for a solidified body, which can calculate a cracked area of the solidified body from an AE signal.

[0007]

[Means for Solving the Problems]

 The crack detection device for a solidified body according to the present invention is a sensor for detecting an ultrasonic signal associated with a crack generated in the solidification / cooling process of a molten glass-like solidified body and an ultrasonic signal detected by this sensor. Acoustic emission signal processing means that outputs an acoustic emission signal, a video camera that captures cracks in the solidified body, and extraction of cracks from multiple images captured by this video camera and calculation of the area The area of the solidified body is calculated from the measured acoustic emission signal, and the correlation between the crack emission area obtained by this means and the acoustic emission signal output from the acoustic emission signal processing means is obtained. And a data processing means for calculating That.

[0008]

[Action]

 The ultrasonic wave generated by the crack of the solidified body which is the object is detected by the sensor, is input to the acoustic emission signal detection means, and is output as the acoustic emission signal. On the other hand, a crack generated in the solidified body is photographed by a video camera and input to the image processing means to extract the crack and calculate its area.

The data processing means obtains the correlation between the acoustic emission signal and the crack area, and thereby calculates the crack area generated in the object from the measured caustic emission signal.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a transparent vitrified solidified body (test object) to be measured, which is cooled from a molten state by using a crucible 5 and is accompanied by cracks generated in the solidification / cooling process. The ultrasonic wave is detected by the ultrasonic sensor 3. The detection signal of the sensor 3 is sent to the AE (Acoustic Emission) signal processing unit 4. The AE signal processing unit 4 processes the detection signal of the sensor 3 and outputs an AE signal.

On the other hand, below the crucible 5, an illuminating device 6 is arranged so that the vitrified solid body 1 can be illuminated through the crucible 5, and above the crucible 5, a video camera 7 is arranged. The video camera 7 captures a crack generated in the entire volume of the vitreous solidified body 1. The image taken by the video camera 7 is recorded by a VTR (video tape recorder) 8 if necessary, and the image information thereof is sent to the image processing section 9. This image processing unit 9 uses the image recorded in the VTR 8 to calculate the difference between the image before and after the AE signal is generated as shown in FIG. 2 to extract only the newly generated crack. , The crack area (one parameter for evaluating the soundness of the subject) is calculated.

Then, the data from the image processing unit 9 and the AE signal processing unit 4 are sent to the data processing unit 10 and processed. The data processing unit 10 obtains the cumulative total number of cracks, the occurrence rate, the effective value, and the like from the AE signal, and plots the crack area obtained for many AE signals and the data related to the AE signal to determine the crack area. Find the correlation with the AE signal. Next, the operation of the above embodiment will be described.

The vitreous solidified body 1 is cooled from a molten state by using a crucible 5, and an ultrasonic signal accompanying a crack generated in the solidification / cooling process is detected by a sensor 3. The detection signal of the sensor 3 is processed by the AE signal processing unit 4 and sent to the data processing unit 10 as an AE signal.

On the other hand, the illuminating device 6 illuminates the transparent vitreous solidified body 1 through the crucible 5, and the video camera 7 photographs cracks generated in the entire volume of the vitreous solidified body 1, and the captured image. Is input to the image processing unit 9 via the VTR 8 as necessary. The image processing unit 9 extracts only newly generated cracks by taking the difference between the images taken before and after the AE signal is generated.

That is, as shown in FIG. 2, the image processing unit 9 displays the image of the crack 2 at the time t (FIG. 2B) and the image of the crack 2 at the time “t + Δt” after the lapse of Δt time (FIG. 2B). The difference between the images is obtained from FIG. 2A, the crack 2 generated within the time Δt (FIG. 2C) is extracted, and the area of the extracted crack 2 is calculated. The image processing unit 9 repeats such image processing a plurality of times to obtain crack areas for a large number of AE signals.

The data processing unit 10 plots the crack area obtained as described above and the corresponding AE signal as shown in FIG. 3, and creates a table showing the correlation between the crack area and the AE signal. . The crack area can be obtained from the measured AE signal by the correlation between the crack area and the AE signal obtained in advance as described above.

[0018]

[Effect of device]

 As described above in detail, according to the present invention, the crack generated in the entire volume of the solidified body is photographed, and the photographed image is processed to extract the crack and calculate the crack, thereby calculating the A E signal and the crack. Since the area correlation is determined, the crack area, which is one of the physical property values of the solidified product, can be calculated from the AE signal measured by this correlation, and the reliability of the measurement of the physical property value of the solidified product is greatly improved. Can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a crack detection device for a solidified body according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining a crack extracting operation in the embodiment.

FIG. 3 is a diagram showing a correlation between an AE signal and a crack area in the example.

FIG. 4 is a diagram for explaining the principle of AE measurement.

[Explanation of symbols]

1 ... Vitrified solid (subject), 2 ... Crack, 3
... sensor, 4 ... AE signal processing unit, 5 ... crucible, 6 ... illumination device, 7 ... video camera, 8 ... V
TR, 9 ... Image processing unit, 10 ... Data processing unit.

Claims (1)

[Scope of utility model registration request] 1. A sensor for detecting an ultrasonic signal associated with a crack generated in a solidification / cooling process of a molten glass-like solidified body, and an ultrasonic emission signal processed by the sensor to output an acoustic emission signal. Acoustic emission signal processing means, a video camera for photographing cracks generated in the solidified body, image processing means for extracting cracks and calculating the area thereof from a plurality of images photographed by the video camera, and by this means And a data processing means for calculating a correlation between the obtained crack area and the acoustic emission signal output from the acoustic emission signal processing means, and calculating the area of the solidified body from the measured acoustic emission signal. A crack detection device for a solidified body characterized by the above.